linux-kernel - Re: [Intel-gfx] Interrupt latency on some 945GM platforms

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Date:	Wed, 22 Sep 2010 08:57:30 +0300
From:	Vasily Khoruzhick <anarsoul@...il.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Paolo Ornati <ornati@...il.com>,
	Simon Farnsworth <simon.farnsworth@...lan.co.uk>,
	intel-gfx@...ts.freedesktop.org,
	Sitsofe Wheeler <sitsofe@...oo.com>,
	Venkatesh Pallipadi <venki@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [Intel-gfx] Interrupt latency on some 945GM platforms

On 22 of September 2010 01:56:53 Jesse Barnes wrote:
 
> Can you guys try something like this?  My theory is that 945GM has some
> power management behavior we're failing to configure correctly.  If
> disabling it works, then it's likely related.

Nope, it doesn't help, sorry

> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_d index 40cc5da..26e1d23 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -5786,6 +5786,10 @@ void intel_init_clock_gating(struct drm_device *dev)
>                                    I915_READ(MCHBAR_RENDER_STANDBY) &
> ~RCX_SW_EX }
>         }
> +
> +
> +       /* Disable power management on 945GM */
> +       I915_WRITE(0x10f10, 0);
>  }
> 
>  /* Set up chip specific display functions */
--
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